FIRST, OB PSILOI ER \N BRANCH. 123 



Despl. d. Champ., locality Blumenstein am Thunei S One of the specimens 

 from Filder shows the exact aspect and markings of /'-//. planorbe, but has the 

 form ■ Though it is somewhat difficult to judge from a figure, 



nevertheless, ./' ' N mayr, very closely resembles PsiL loitgipontimtm, 



and we have considered it to l»»- a variety <>t' this Bpecies with Bomewhat Btouter 

 whorls than the normal form. It i- al-i> a large aged specimen, and according t<> 

 Neumayr came from Wurtemburg. 



it referred this species, in bis " Ammoniten des Schwabischen Jura," 

 I Hi- comparisons were evidentl} made with the old wborl of 



rid, .1- tlii- has no keel, ami is smooth <>r with obsolescent pilae, it 

 very like the adult stag ; . longiponiinvm. Nevertheless, both the 



_ ami adult Btages of laqvewm are easily distinguished from the same 



<> stedt's figure shows the length of the living chamber to 

 have exc eded one volution. 



I Blake's citation <>t'tlii> Bpecies from the Angulatus bed 1 is likely to 

 mislead. Their Bpecies is, as figured, a diseased Caloceras, or poorly drawn 

 Schlotheimia with pilae crossing the abdomen, but certainly not, as 

 named by them, hngiponty 



iiiul Bubseriea figured l»\ Neumayr in the work quoted 



lows Pi ' •yptogomum, Plate VI., is discoidal. P ut and 



'. Plate V., are slightly more involute - 1 1 « ■ 1 1 s . Wahner, in Volume I\ of 



the work above quoted, figures /' . Plates XV., W I . /'•■ . erebri- 



, P • - \ \ I . \\ III . /'- pa hyd and polgphyllum, Plate XVII., all 



il shells. This subseries and the preceding agr dosely with the western 



European forms except in the involute Bpecies. Wahner also figures, in \ <»l- 

 ume III. "t the same \\<>ik. /' Bcrchla and aphanopiychum, Plate XXIII . 

 which are discoidal, and /'«/. pit Plate XXV., ! Plate 



XXIV., and A XXI\ . XXV., which are more involute and 



cum j 



TlllKD Si KM i:ii 8 



Psiloceras Haj?cnowi, w*£hxsb. 



A mm 



A mm VIII. | 



Am 



I form nf tlii- nhell approximates t«. that • >! /'-//. , ir. Itve, but the 



sutures are more widely distinct, and d< in outlini I rerquem and 



tnble < | ii i t •* closely 1 1 ■ « - sutures of /' A 



and a ' 1 1 The lobes "I that figured bj Q 

 are ni • l\ dentate, and approximate n closcl) to the sutun ol P 



